Restructuring Charges (Restructuring Charges) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	$ 0	$ 20
Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges		20
Restructuring Charges | Drilling and Evaluation [Member] | Operating Segments
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	0	5
Restructuring Charges | Well Construction And Completion | Operating Segments
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	0	7
Restructuring Charges | Production And Intervention | Operating Segments
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	0	5
Restructuring Charges | Corporate and Other | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Severance, asset impairment and other restructuring charges	$ 0	$ 3